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LINUX System : Lecture 7

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Process Control Subsystem (2) Managing process structures (proc table, u table, ... Communicate with file subsystem. Loading a file into memory for execution ... – PowerPoint PPT presentation

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Title: LINUX System : Lecture 7


1
LINUX System Lecture 7
  • Bong-Soo Sohn

Lecture notes acknowledgement The design of
UNIX Operating System
2
Architecture of the UNIX
user programs
libraries
trap
user Level kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
3
System calls Libraries
user programs
libraries
trap
user Level kernel Level
system call interface
system call interface
file subsystem
buffer cache
hardware control
hardware
4
System calls Libraries
  • System call library
  • OS service in the form of C function call
  • Standard library, User library
  • Linked with the programs at compile time and are
    part of the user program

5
File Subsystem (1)
user programs
libraries
trap
user Level kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
6
File Subsystem (2)
  • Managing files and structures of file system
  • Allocating file space
  • Administering free space
  • Controlling access to files
  • Retrieving data for users
  • Interact with set of system calls
  • open, close, read, write, state, chown, chmod

7
Buffering Mechanism (1)
user programs
libraries
trap
user Level kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
8
Buffering Mechanism (2)
  • Interact with block I/O device drivers to
    initiate data transfer to and from kernel.

9
Process Control Subsystem (1)
user programs
libraries
trap
user Level kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
10
Process Control Subsystem (2)
  • Managing process structures (proc table, u
    table,)
  • Process scheduling
  • Interprocess communication (IPC)
  • Memory management
  • Responsible for process synchronization.
  • Communicate with file subsystem
  • Loading a file into memory for execution
  • Interact with set of system calls
  • fork, exec, exit, wait, brk, signal

11
Process Control Subsystem (3)
  • Memory management module
  • Control the allocation of memory to a process
  • Scheduler module
  • Allocate the CPU to processes
  • Interprocess communication
  • There are several forms.

12
Hardware Control (1)
user programs
libraries
trap
user Level kernel Level
system call interface
file subsystem
buffer cache
hardware control
hardware
13
Hardware Control (2)
  • Responsible for handling interrupts and for
    communicating with the machine.
  • Devices such as disks or terminals may interrupt
    the CPU while a process is executing

14
Topics to be covered
  • File subsystem
  • Process control subsystem
  • (Memory Management)
  • Signal
  • IPC (Inter-Process Communication),
    Synchronization
  • UNIX System Programming (System Calls)

15
Reference Books
  • The design of the UNIX Operating System, M. J.
    Bach
  • UNIX Internals The New Frontiers, U. Vahalia
  • Advanced Programming in the Unix Environment, 2nd
    Edition, W. R. Stevens, S. A. Rago
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